Hi
Are you referring to the exported video as a DVD?
If so, it may play immediately in some players if you have not added a menu. So to prevent this happening add a menu to the export. The menu will then auto play and await your input. Depending on how you have set it up you can then click on the area or button you have designated in the menu to play your video.
If it's not this then can you clarify what you mean exactly by auto-starts?
Nat